Wednesday, December 22, 2010

Diesel Cycle

Diesel Cycle

The Diesel cycle is an ideal air standard cycle which consists of four processes:

1 to 2: Isentropic compression

2 to 3: Reversible constant pressure heating

3 to 4: Isentropic expansion

4 to 1: Reversible constant volume cooling

By defining the compression ratio, r, as:
and cut-off ratio, , as:
The thermal efficiency of an Diesel cycle with a perfect gas as working fluid is:
where,
n= = a constant depending on specific heat capacity